Sounds like a worn engine.....the more clearance you have on the crank bearings....the more oil leaks out from them....lowering the pressure......but that doesn't mean you can't run it .As long as you have some higher pressure when working the engine.....I wouldn't worry about it.It is normal for the pressure to drop a little at slower engine speed when warmed up.Why not put in a thicker oil.Try a 20w40 or 20w50 or straight 40 if your weather is warm to increase warm/hot oil pressure.

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was it literly a minute that it ran or was it like 10-15 minutes with you reving it up a bit? It could be many different things from as simple as it ran out of the gas that was in the carb and the tank valve is shut off to things like your magneto coil is shorted, no spark. Have you checked for spark and fuel? Does the engine have compression? More details will help solve your problem.

hi try cleaning the air filter box might be filled with oil so all you have to do is clean the air filter out with water let it dry and soak all the oil up with a rag or sponge. and try to replace the battery and spark plugs, thats what i did for my 2005 polaris sportsman 500 ho. Best of luck!

70lbs for a 90cc should be good, but 80-85 is better. Compression drops from piston rings wearing out, most of the time. Piston rings wear out from old oil...every time. Rule of Thumb: 5 tanks of gas, change your oil !!! It's not a car !!! A car has 5 quarts of oil which takes about 3 months to break down (2,000 miles or so), 90 cc engine has a half a quart, which takes about 3 weeks to break down (based on everyday use) SO...5 tanks of gas, change your oil..

as for the not starting thing, check for spark (should be a blue spark ONLY, any other, replace plug, orange won't ignite gas) if you haven't been riding for a while, open the drain screw on the bottom the carburetor and drain the water out. Ethanol turns to water when the gas sits too long...

If you have valves at the pre tank you can run it till it shuts down then close the inlet valve and the outlet valve. Wait and see if it goes on again. If so you have a problem in the pressure tank or the switch mech. If not open the outlet valve and wait. If it starts you have a leak somewhere in the house. If not open the intake valve and see what happens. If it kicks on then you have a problem with you check od backflow valve. If this is a shallow well pump it could be in the supply line also. Good luck.

The control unit is faulty, I had that problem twice.. I have now bypassed the control unit and use a normal pump pressure switch to control..works fine..The Grundfos company at first said I had to have air in the lines then admitted the control assy. was at fault. after two new units in three years I did away with the control unit.